990847f475
disk devices have to consist of a block of sectors. Thus, when writing gptboot to the boot partition, round the size of the gptboot file up to a sector boundary, pre-zero it, and write out the full buffer to disk.
272 lines
6.7 KiB
C
272 lines
6.7 KiB
C
/*-
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* Copyright (c) 2007 Yahoo!, Inc.
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* All rights reserved.
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* Written by: John Baldwin <jhb@FreeBSD.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the author nor the names of any co-contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <assert.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include "map.h"
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#include "gpt.h"
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static uuid_t boot_uuid = GPT_ENT_TYPE_FREEBSD_BOOT;
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static const char *pmbr_path = "/boot/pmbr";
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static const char *gptboot_path = "/boot/gptboot";
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static u_long boot_size;
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static void
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usage_boot(void)
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{
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fprintf(stderr,
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"usage: %s [-b pmbr] [-g gptboot] [-s count] device ...\n",
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getprogname());
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exit(1);
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}
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static int
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gpt_find(uuid_t *type, map_t **mapp)
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{
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map_t *gpt, *tbl, *map;
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struct gpt_hdr *hdr;
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struct gpt_ent *ent;
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unsigned int i;
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/* Find a GPT partition with the requested UUID type. */
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gpt = map_find(MAP_TYPE_PRI_GPT_HDR);
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if (gpt == NULL) {
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warnx("%s: error: no primary GPT header", device_name);
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return (ENXIO);
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}
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tbl = map_find(MAP_TYPE_PRI_GPT_TBL);
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if (tbl == NULL) {
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warnx("%s: error: no primary partition table", device_name);
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return (ENXIO);
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}
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hdr = gpt->map_data;
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for (i = 0; i < le32toh(hdr->hdr_entries); i++) {
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ent = (void *)((char *)tbl->map_data + i *
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le32toh(hdr->hdr_entsz));
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if (uuid_equal(&ent->ent_type, type, NULL))
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break;
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}
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if (i == le32toh(hdr->hdr_entries)) {
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*mapp = NULL;
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return (0);
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}
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/* Lookup the map corresponding to this partition. */
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for (map = map_find(MAP_TYPE_GPT_PART); map != NULL;
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map = map->map_next) {
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if (map->map_type != MAP_TYPE_GPT_PART)
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continue;
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if (map->map_start == (off_t)le64toh(ent->ent_lba_start)) {
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assert(map->map_start + map->map_size - 1LL ==
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(off_t)le64toh(ent->ent_lba_end));
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*mapp = map;
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return (0);
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}
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}
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/* Hmm, the map list is not in sync with the GPT table. */
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errx(1, "internal map list is corrupted");
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}
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static void
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boot(int fd)
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{
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struct stat sb;
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off_t bsize, ofs;
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map_t *pmbr, *gptboot;
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struct mbr *mbr;
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char *buf;
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ssize_t nbytes;
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unsigned int entry;
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int bfd;
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/* First step: verify boot partition size. */
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if (boot_size == 0)
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/* Default to 64k. */
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bsize = 65536 / secsz;
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else {
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if (boot_size * secsz < 16384) {
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warnx("invalid boot partition size %lu", boot_size);
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return;
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}
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bsize = boot_size;
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}
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/* Second step: write the PMBR boot loader into the PMBR. */
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pmbr = map_find(MAP_TYPE_PMBR);
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if (pmbr == NULL) {
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warnx("%s: error: PMBR not found", device_name);
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return;
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}
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bfd = open(pmbr_path, O_RDONLY);
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if (bfd < 0 || fstat(bfd, &sb) < 0) {
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warn("unable to open PMBR boot loader");
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return;
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}
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if (sb.st_size != secsz) {
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warnx("invalid PMBR boot loader");
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return;
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}
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mbr = pmbr->map_data;
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nbytes = read(bfd, mbr->mbr_code, sizeof(mbr->mbr_code));
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if (nbytes < 0) {
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warn("unable to read PMBR boot loader");
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return;
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}
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if (nbytes != sizeof(mbr->mbr_code)) {
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warnx("short read of PMBR boot loader");
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return;
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}
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close(bfd);
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gpt_write(fd, pmbr);
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/* Third step: open gptboot and obtain its size. */
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bfd = open(gptboot_path, O_RDONLY);
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if (bfd < 0 || fstat(bfd, &sb) < 0) {
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warn("unable to open GPT boot loader");
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return;
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}
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/* Fourth step: find an existing boot partition or create one. */
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if (gpt_find(&boot_uuid, &gptboot) != 0)
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return;
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if (gptboot != NULL) {
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if (gptboot->map_size * secsz < sb.st_size) {
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warnx("%s: error: boot partition is too small",
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device_name);
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return;
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}
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} else if (bsize * secsz < sb.st_size) {
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warnx(
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"%s: error: proposed size for boot partition is too small",
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device_name);
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return;
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} else {
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entry = 0;
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gptboot = gpt_add_part(fd, boot_uuid, 0, bsize, &entry);
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if (gptboot == NULL)
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return;
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}
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/*
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* Fourth step, write out the gptboot binary to the boot partition.
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* When writing to a disk device, the write must be sector aligned
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* and not write to any partial sectors, so round up the buffer size
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* to the next sector and zero it.
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*/
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bsize = (sb.st_size + secsz - 1) / secsz * secsz;
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buf = calloc(1, bsize);
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nbytes = read(bfd, buf, sb.st_size);
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if (nbytes < 0) {
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warn("unable to read GPT boot loader");
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return;
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}
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if (nbytes != sb.st_size) {
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warnx("short read of GPT boot loader");
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return;
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}
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close(bfd);
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ofs = gptboot->map_start * secsz;
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if (lseek(fd, ofs, SEEK_SET) != ofs) {
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warn("%s: error: unable to seek to boot partition",
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device_name);
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return;
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}
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nbytes = write(fd, buf, bsize);
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if (nbytes < 0) {
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warn("unable to write GPT boot loader");
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return;
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}
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if (nbytes != bsize) {
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warnx("short write of GPT boot loader");
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return;
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}
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free(buf);
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}
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int
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cmd_boot(int argc, char *argv[])
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{
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char *p;
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int ch, fd;
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while ((ch = getopt(argc, argv, "b:g:s:")) != -1) {
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switch (ch) {
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case 'b':
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pmbr_path = optarg;
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break;
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case 'g':
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gptboot_path = optarg;
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break;
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case 's':
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if (boot_size > 0)
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usage_boot();
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boot_size = strtol(optarg, &p, 10);
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if (*p != '\0' || boot_size < 1)
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usage_boot();
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break;
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default:
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usage_boot();
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}
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}
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if (argc == optind)
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usage_boot();
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while (optind < argc) {
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fd = gpt_open(argv[optind++]);
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if (fd < 0) {
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warn("unable to open device '%s'", device_name);
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continue;
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}
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boot(fd);
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gpt_close(fd);
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}
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return (0);
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}
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